研究目的
To characterize the EMP generated during high intense laser-target interaction, focusing on its propagation inside and outside the target chamber, and to develop mitigation strategies against EMI caused by EMP.
研究成果
The study demonstrated that the target chamber attenuates EMP signals by more than one order of magnitude. FEM simulations confirmed that low-frequency EMP signals are attenuated due to the size of window apertures, while high-frequency signals above 2.5 GHz are absorbed by glass windows. The findings underscore the importance of mitigation strategies against EMP for the reliable operation of high-intensity laser facilities.
研究不足
The study was limited by the simulation capacity, which did not incorporate the optics, devices, antennas, and auxiliaries in the FEM simulations. The simulations were also limited to frequencies up to 2 GHz due to resource constraints.
1：Experimental Design and Method Selection:
The study involved measuring EMP inside and outside the target chamber using semi-log and Moebius loop antennas, respectively, during high intense laser-target interaction experiments. FEM simulations were used to model the EMP emission into the target area.
2：Sample Selection and Data Sources:
The experiments were conducted at Centro de Laseres Pulsados (CLPU) using a 200 TW Vega 2 laser pulse focused onto an Al foil target.
3：List of Experimental Equipment and Materials:
Equipment included a semi-log antenna, Moebius loop antenna, current probe, and a Network Analyser. Materials included Al foil targets and glass windows in the target chamber.
4：Experimental Procedures and Operational Workflow:
The laser pulse was focused onto the target, and EMP signals were measured inside and outside the target chamber. The induced current in a stepper motor's phase line was also measured.
5：Data Analysis Methods:
The EMP signals were analyzed for amplitude and spectrum. FEM simulations were compared with experimental results to understand EMP propagation.
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